Method of sensitizing electron emissive surfaces of antimony bas

Details Method of sensitizing electron emissive surfaces of antimony bas Method of sensitizing electron emissive surfaces of antimony bas

1975-06-04

1977-01-11

Esposito, Michael F.

Coating processes

Electrical product produced

Electron emissive or suppressive

427 77, 427250, 427377, 427380, 427383R, 427383A, 427383B, 427383C, 316 5, 316 6, 316 8, 316 12, H01J 922, B05D 512

Patent

active

040027350

ABSTRACT:
In a photomultiplier tube, antimony layers of a photocathode and a plurality of dynodes are simultaneously sensitized by exposure to the vapors of sodium and potassium at an initial temperature of less than about 120.degree. C. The temperature of exposure is gradually increased at a rate of less than about 10.degree. C. per minute until a final temperature of about 200.degree. C. is reached. Then, the photocathode and dynodes are baked at the final temperature until substantially maximum photosensitivity is achieved. The photocathode and dynodes are thereafter exposed to cesium and may be superficially oxidized until substantially maximum photosensitivity is achieved.

REFERENCES:
patent: 2914690 (1959-11-01), Sommer
patent: 3372967 (1968-03-01), Hughes
patent: 3658400 (1972-04-01), Heluy
patent: 3753023 (1973-08-01), Sommer
patent: 3838304 (1974-09-01), McDonie
patent: 3884539 (1975-05-01), Sommer

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